To provide an adaptive equalizer that can stably decides the degree of convergence of even a signal varying in spectrum from moment to moment like a voice and can also decide the convergence state even in presence of noise.
Disclosed is the adaptive equalizer used for communication equipment, an audio signal processor, etc., and the adaptive equalizer has a transfer function estimating means 206 of estimating a transfer function to be equalized, a filter means 204 of performing equalization processing, a filter coefficient updating means 207 of updating the coefficient value of the filter means 204 based upon the estimation result of the transfer function estimation means 206, a filter coefficient peak value detecting means 208 of detecting a peak value in a tap coefficient group of the filter means 204, and a convergence degree deciding means 209 of deciding the degree of convergence of the filter means 204 based upon the detection result of the filter coefficient peak value detecting means 208, and can directly detect and use the update progress state of the tap coefficients to decide the degree of convergence.
Tomoyasu Sakaguchi
Hiroki Naito